Orbiting The Moonis tricky. There's a big planet nearby (Earth) that tugs on satellites and destabilizes their orbits. NASA researchers have an idea for a new class of orbits that may solve the problem.

NASA is returning to the Moon, but first NASA engineers would like to test designs for lunar landers and rovers on genuine lunar soil. Just one problem: There's not enough real moondust to go around. So scientists are making some "true fakes."